Problem: In Takahashi's mind, there is always an integer sequence of length 2 \times 10^9 + 1: A = (A_{-10^9}, A_{-10^9 + 1}, ..., A_{10^9 - 1}, A_{10^9}) and an integer P.

Initially, all the elements in the sequence A in Takahashi's mind are 0, and the value of the integer P is 0.

When Takahashi eats symbols `+`, `-`, `>` and `<`, the sequence A and the integer P will change as follows:

* When he eats `+`, the value of A_P increases by 1;
* When he eats `-`, the value of A_P decreases by 1;
* When he eats `>`, the value of P increases by 1;
* When he eats `<`, the value of P decreases by 1.



Takahashi has a string S of length N. Each character in S is one of the symbols `+`, `-`, `>` and `<`. He chose a pair of integers (i, j) such that 1 \leq i \leq j \leq N and ate the symbols that are the i-th, (i+1)-th, ..., j-th characters in S, in this order. We heard that, after he finished eating, the sequence A became the same as if he had eaten all the symbols in S from first to last. How many such possible pairs (i, j) are there?

Constraints

* 1 \leq N \leq 250000
* |S| = N
* Each character in S is `+`, `-`, `>` or `<`.

Input

Input is given from Standard Input in the following format:


N
S


Output

Print the answer.

Examples

Input

5
+>+<-


Output

3


Input

5
+>+-<


Output

5


Input

48
-+><<><><><>>>+-<<>->>><<><<-+<>><+<<>+><-+->><<


Output

475

Solution (in CPP):

Solution:
#include<bits/stdc++.h>
using namespace std;
typedef long long ll;
typedef unsigned long long ull;
const int N=250005;
ull p1=233,p2=1;
int n;
ll ans;
ull f[N],f2[N];
char s[N];
map<ull,int> mp;
int main(){
	scanf("%d",&n);
	ull tmp=p1;
	for(int i=1;i<=63;i++){
		p2*=tmp;
		tmp*=tmp;
	}
	scanf("%s",s+1);
	f[0]=0,f2[0]=1;
	for(int i=1;i<=n;i++){
		f[i]=f[i-1],f2[i]=f2[i-1];
		if(s[i]=='+')f[i]+=f2[i];
		else if(s[i]=='-')f[i]-=f2[i];
		else if(s[i]=='>')f2[i]*=p1;
		else if(s[i]=='<')f2[i]*=p2;
		mp[f[i]]++;
	}
	for(int i=1;i<=n;i++){
		ans+=mp[f[n]*f2[i-1]+f[i-1]];
		mp[f[i]]--;
	} 
	printf("%lld",ans);
	return 0;
}